ROOT Analysis of 2004 ATLAS Test Beam Data

ROOT Analysis of 2004 ATLAS Test Beam Data & Studies of Sense Wire Displacements in MDT’s Divine Kumah Tuesday June 29 th, 2004 CERN, Switzerland Mentor: Dr. Daniel Levin • Preliminary Talk

Outline • Project Overview • Scope of my project • Progress • Future Work • Questions • Preliminary Talk

Atlas Overview (A Toroidal LHC Apparatus) • General-purpose experiment to study proton-proton collisions in the LHC • 144 member institutions with 1500 scientists • Range of Study includes: – Search for Higgs Boson – Origins of CP violation – Search for Supersymmetric particles • Preliminary Talk

Large Hadron Collider Beam Preparation and Injection • LINAC’S • PS • SPS Detectors • ATLAS • ALICE • CMS • LHCb • Preliminary Talk

Atlas Setup (A Toroidal LHC Aparatus) • Preliminary Talk

MDT Chamber Setup • Each MDT consists of 2 multilayers separated by a crossframe. • Each multilayer has 3 or 4 layers of cylindrical gas filled aluminum • Tube diameter 30 mm • Gas Mixture tubes • Ar (93%), CO 2 (7%) • Tungsten sense wire (anode) • Preliminary Talk

Drift Tube Operation Muon Track Drift tube dx maximum drift-time of ~700 • - ns Measured relation between drift distance and drift time for the ATLAS operating point. v = 20 mm/ns Muon momentum inferred from curvature of muon track • Preliminary Talk

MDT Operational Parameters Parameter Value Tube radius (rtube) 15. 0 cm Wire radius (rwire) 2. 50 x 10 -6 m Wire density () 19. 3 g/cm 3 Wire Tension (T) 3. 43 N Operating Voltage 3080 V Tube Length (L) 1. 5 - 6 m • Preliminary Talk

Wire Displacement Studies • Causes of Wire Displacement – Gravity – Electrostatic Forces – Thermal Gradients – Vibrations • Preliminary Talk

Wire Displacement Studies Gravitational Sag Resultant sag from Fgravity and Felec Tube Length Max Gravitational Electrostatic Resultant (m) Sag (mm) amplification Sagitta (mm) 1. 5 30 1. 00001 30. 00003 6. 0 481. 326 1. 00017 481. 4 • Preliminary Talk

2004 Test Beam Program • Preliminary Talk

H 8 Data Analysis in ROOT Code in development converts PAW data into ROOT files and analyses information Mutrak Utility converts Data to PAW files Data Acquisition for Chambers at H 8 Test Facility • Preliminary Talk

Drift Time Spectra H 8 Data Analysis in ROOT • Preliminary Talk

H 8 Data Analysis Beam profiles for test beam runs 600378 & 600379 • Preliminary Talk

Future Work • Analyze Cosmic Ray Experiment data to investigate the effect of variable wire displacements on Drift Time Spectra • Compare real data with Garfield Simulations • Complete the creation of a set of ROOT classes to automatically analyze H 8 Data • Preliminary Talk

Acknowledgements • Dan Levin, Ed Diehl • The University of Michigan CERN REU Program • Jean Krisch, Homer Neal, Jeremy Birnholtz • CERN, FORD • The UM REU students • Preliminary Talk

QUESTIONS? ? • • Preliminary Talk